Most people throw out their PC’s by now. But a hard drives can take a lot of abuse. I seriously don’t think your hard drive is junk. Its hard to figure out the problem remotely.
This very same thing happened to me a few months ago. The windows program is infected with a virus. In your registry a malicious key has been installed instructing your system to cause these failures.
Well if your quick on the draw go to start>>>run>>> type in shutdown -a hit enter. This might buy you enough time to get that key otta there.
If it don’t work, hit the yellow pages and call up the “geek squad”. I seriously don’t think there is anything wrong with your PC other than it having a trojan on board. greek39